Spring-motor for sewing-machines



(No Model.) 3 Sheets--Sheet 1;

D.v M. PFAUTZ'. SPRING MOTOR FOR SEWING MACHINES.

No. 417,081. Patented Dec. 10, 1889.

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(No Model.) 3 Sheets-Sheet 2.

D. M. PFAUTZ.

SPRING MOTOR FOB SEWING MACHINES.

No. 417,081. Patented Dec. 10, 1889.

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(No Model.) 3 Sheets-Sheet 3. I D. M. PFAUTZ.

7 SPRING MOTOR FOR SEWING MACHINES;

No. 417,081. PatentedDeo. 10, 1889..

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UNITED STATES PATENT OFFICE.

DANIEL M. PFAUTZ, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR OF THREE-EIGHTHS TO REINHART K. BARRETT, OF SAME PLACE, AND RURIC N. ADAMS, OF CAMDEN, NEW JERSEY.

SPRING-MOTOR FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent N0. 417,081, dated December 10, 1889.

Application filed January 19, 1889. Serial No. 296,845. (No model.)

To all whom it may concern:

Be it known that I, DANIEL M. PFAUTZ, a citizen of the United States, and a resident of Philadelphia, Pennsylvania, have invented certain Improvements in Spring-Motors for Sewing-Machines, of which the following is a specification.

The object .of my invention is to so construct a spring-motor for sewing-machines that any desired amount of power can be imparted to the driving-shaft of the machine. This object I attain in the manner hereinafter set forth, reference being had to the accompanying drawings, in which Figure 1 is an end view of a sewing-machine with my improved spring-motor applied thereto, the spur-wheels being shown mostlyin outline, with teeth only at the actual meshing-points. Fig 2 is a section on the line 1 2, Fig. 1. Fig. 3 is a rear view of the motor, and Fig. 4 is a detached View of a portion of the same. v

A A are the opposite end frames of the machine, in which are formed bearings for a series of spring-shafts B D I J, intermediate frames E and F being also provided, which, however, are of less dimensions than the end frames A A, as they only serve to carry shafts at the rear portion of the machine. Each of the spring-shafts carries in the present instance a series of small springs a", the inner end of each of which is secured to the shaft, while its outer end is secured to a fixed rod it, carried by the frames, so that on turning the spring-shaft in one direction its springs will be wound up and on releasing the shaft the resiliency of the springs will cause the turning of the same in the opposite direction. A series of small springs on each sha-ftis en1- ployed in preference to a single or smallnumber of large springs, because of the greater cheapness of the small springs and the greater readiness of replacing one of them when broken or defective.

On the shaft B is a loose spur-wheel l1, and gearing into said spur-wheel is a pinion b on a shaft 71 which is squared or otherwise formed at the end for the reception of a crank, whereby the turning of the shaft is effected when it is desired to wind up the springs of the shaft B. In like manner the spring-shaft D is wound by gearing d cl and shaft 01 the spring-shaft I by gears ti and shaft i and the springshaft J by gears j j and shaft The shaft B has a spur-wheel b which has the usual ratchet-and-pawl connection with the shaft, as shown in Fig. 4, so that the shaft can turn independently thereof when the springs are being wound up, the wheel turning with the shaft in the opposite direction. This wheel 13 gears into a pinion B on a counter-shaft B adapted to bearings in the frames A and F of the machine, and the shafts D, I, and J are provided with like gears and counter-shafts lettered to correspond with their respective s'pringshafts.

G is the driving-shaft of the machine, having a pulley G, connected by a belt g to the pulley G on the main shaft of the machine, and said driving-shaft G has a pinion G", which gears into a spur-wheel H on a powertransmitting counter-shaft II, which has as many loose pinions h as there are springshafts, each of these pinions carrying one half of a clutch, the other half of which is formed on a sleeve m, sliding on but splined to the shaft II and controlled by an arm m on a shaft m which is adapted to hearings in a suitable bar m of the frame and has at the front end a handle on", so that it can be readily operated by the attendant to throw its pinion into or out of engagement with the shaft II.

The counter-shaft B of the spring-shaft B has a spur wheel B, gearing into one of the pinions h, and the counter-shaft D of the spring-shaft D likewise has a spur-wheel D, gearing into one of the pinions h; but the movement of the counter-shaft I is transmitted to its corresponding pinion h by means of a spur-wheel I on the counter-shaft and an. intermediate spunwheel I loose on the countenshaft D while the movement of the lowest counter-shaft is transmitted to its proper pinion h through the medium of a spur-wheel J on the shaft and two intermediate loose spur-wheels J 5 and J located, respectively, on the shafts I and D It will thus be seen that by a proper adjustment of the clutches m the power of any one or more of the spring-shafts may be transmitted to the driving-shaft of the machine, the power of the separate spring-shafts being exerted in succession when moderate and long-contin ued power is required, or the power of all the shafts being exerted simultaneously when necessary.

The stopping and starting of the machine are controlled by a friction-brake consisting of a drum n on the shaft H, having a brake-strap n, the ends of which are connected to two arms of a three-armed lever K, the third arm of which is acted on by a spring 11 tending to apply the brake, and by a rod a connected to a treadle M, on depressing which the brake will be released.

In order to prevent the running away of either of the spring-shafts when it is disconnected from the shaft H, each of said shafts has a friction-brake similar to that of the shaft H, the lever K of each of these brakes being connected by a rod 1) to an arm 19 on a shaft 19 which extends to the front end of the machine and has an operatinghandle p and retainingratchet 19 so that the brake-lever can. be held either in the retaining or releasing position.

Having thus described my invention, I claim and desire to secure by Letters Patent 1. The combination of the driving-shaft, clutch-pinions on said shaft, a series of spring shafts, and gearing for connecting each of said spring-shafts to one of the clutch-pinions on the transmittingshaft, substantially as specified.

2. The combination of the driving-shaft, the power transmitting shaft geared thereto, clutch-pinions on said shaft, a series of springshafts each having a friction-brake, and gearing connecting each of said spring-shafts to one of the clutch-pinions of the transmittingshaft, substantially as specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

' DANIEL M. PFAUTZ.

Witnesses:

\VILLIAM D. OoNNER, HARRY SMITH. 

